Complete analogous pair - Cells : Tissues : :Atoms : ?

B. MOLECULES

In the following question, a matrix of certain characters is given. These characters follow a certain trend, row-wise or column-wise. Find out this trend and choose the missing character accordingly.
BD3 CE5 DF15
EG2 FH4 GI8
HJ4 IK6 ?

A. JL24

Complete analogous pair - Visitor : Invitation : : Witness : ?

A. SUBPOENA

Complete analogous pair - Breeze : Cyclone : : Drizzle : ?

D. DOWNPOUR

Complete analogous pair - Quartz : Radio : : Gypsum : ?

C. CEMENT